I chose to work with Purple Mountain because I knew Brian (the owner) would be doing the work himself. Typically, that means high quality work, and that was the case here. My radon dropped down to about 10% of its original value. Radon, of course, fluctuates, but most of the time, the radon in my basement stays below 1 pC/L, and it's never above 1.5 pC/L, which is well below the safe limit.
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